Sickle-grinder.



T. JACOBS.

SICKLE GRINDER.

APPLICATION FILED APR. 18. 19!?- smww Patented Jan. 15,1918.

2 SHEETS-SHEET I.

T jma T. JACOBS.

SICKLE GRiNDER. APPLICATION FILED APR. 18. 1911.

11 fi flggu Patented. Jan. 15, 1918.

2 SHEETS-SHEET 2.

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THEODORE JACOBS, OF MOQBETON, NORTH DAKOTA.

SICKLE-GBINDER.

Specification of Letters Patent.

Patented Jan. 15, 1913..

Application filed April 18, 1917. Serial No. 163,083.

To all whom it may concern:

Be it known that I, THEODORE JACOBS, a citizen of the United States, residing at Mooreton, in the county of Richland, State of North Dakota, have invented certain new and useful Improvements in Sickle-Grinders; and I do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to supports for grinding machines, and has particular reference to a support for holding mowing machine sickles or knives in grinding relation to the grinding wheel.

The object of the invention is to provide an adjustable support for carrying the sickles or knives of mowing machines in such relation to the grinding wheel that the teeth of the plate may be uniformly ground to the same angle and depth. To this end, I have constructed a frame which may be adapted to the frame of a grinding wheel, which is either hand or power driven and in which the knife blade may be positioned. for the purpose of throwing it into contact with the grinding wheel at the proper angle, both for the bevel of the tooth and location of the various teeth.

It is furthermore an object of the invention to provide an attachable support of the type above defined by means of which the mower blade may be held in proper position for grinding in such a manner that the operator is enabled to operate the grind stone and also direct the blade for grinding.

With the above and other objects in view, and such others as may hereinafter appear, my invention will now be fully set forth and described, reference being had to the accompanying drawings.

In the drawings Figure 1 is a front elevation of a manually operated grind stone showing my invention applied thereto.

Fig. 2 is a side elevation thereof.

Fig. 3 is an enlarged perspective view of the support for the blade.

Fig. 4 is a section on line ll of Fig. 3.

Fig. 5 is a section on line 55 of Fig. 3.

Fig. 6 is an enlarged end View of the blade support.

Fig. 7 is a detail S is an enlarged detail sectional view of one of the standards of the blade support.

Referring more particularly to the draw ings. 1 represents. the frame of a grinding wheel, in whichis mounted the grinding wheel 2, the latter being adapted to be oper ated by a hand crank 3. Mounted across the forward legs of the frame 1 near the feet of the latter is a base rod 4, within which are mounted the vertically projected pins 5 the latter extending above the rod 4 and providing supports for the lower ends of the tubular standards 6, the set screws 7 en tered through the walls of the standards 6 providing a means for securing the latter on the pins 5. Each of the standards carries a slidable rod 8 whose position relative to the tubular standard 6 may be fixed by means of the adjusting screws 9. Removably secured to the upper ends of the rods 8 is a hinge structure 10 which is best shown in Fig. 7. One leaf of each of the hinges 10 is provided with a plurality of radial grooves 11 which cooperates with a corresponding set of grooves formed upon the flattened end of each of the rods 8. Bolts 12 are passed through the rods and the hinge leaves, and upon their threaded ends carry the butterfly nuts 13 by means of which the rods and hinges may be securely fastened together in adjusted position. The opposite leaves of the hinges 10 extend longitudinally along the lower face of a flat support bar 141, and are grooved at 11 in transverse relation to interfit with corresponding grooves on the bar 1%, said screws 15 being employed to removably secure the bar 14 to the hinges. From the description up to this point it will be evident the bar 14, and consequently the blade which is supported thereby may be located at any angular relation to the grinding surface of the wheel 2, not only transversely of said surface but toward and away from the surface.

Also secured to the lower face of the bar 1-1 is a hook 16 which may be engaged with an eyelet 17 carried by the frame 1, in order to properly seat the bar 14 in its angular position toward or away from the peripheral grinding surface of the wheel 2.

The blade 1-1 together with its accessories, constitutes a guide through which the blade of the mower may he slid in order to position it for the grinding of the several teeth .lt w l b ece s t the wer ing machine blade or sickle consists of a bar or back to one face of which are secured the triangular teeth, the bar generally terminating in a head. Therefore the bar 14 at its far end (the left end in Fig. 1) has secured to its upper face a flat guide plate 18 which extends forwardly from the frontedge of the bar and cooperates with a second guide plate 19 mounted upon the under face of the bar. The guide plate 19 has an offset, so that a space 20 is provided for the passage of the back or supporting bar of the blade, and a forward arm 21 lies in such spaced relation to the guide plate 18 that a guide way is formed which closely embraces the teeth of the mower blade. \Vithin the spaces 20 the guide plate 18 is provided with a transverse groove 22 which provides a means for the passage of the rivets which secure the sickle teeth to the mower blade bar. At its opposite end the bar 14 is provided with a guide plate 21, which also has an offset and is secured to the upper face of the bar 14. The guide plate 23 cooperates with the guide plate 24 which is secured below the bar 14 and opposes the guide plate 22 in such relation as to also provide a guide way for closely embracing the sickle teeth. Furthermore, the guide plate 24 is provided with a comparatively deep channelway 25 which opposes the offset position of the guide plate 23. The channelway 25 and the offset portion of the guide plate 23 provide a passage for the supporting bar of the sickle and also permit the passage of the sickle blade head beyond the end of the bar 14, so that the end teeth of the blade may be properly ground.

Secured substantially at the middle part of the bar 14 is a tongue 26 which extends forwardly beyond the bar and at its outer end is provided with a set screw 27 which may be turned so that its foot will bear against the tooth of the blade in order to set the latter for sharpening. Also finger lever 28 is pivotally mounted to rock upon the bar 14 and has its forward end provided with a notch or indentation 29 which is adapted tofit over the rivet heads by means of which the bar of the s ckle blade is secured to the sickle above. The rear end of the finger 28 is suitably shaped to be grip ed or engaged by the fingers in order to lift it against the pressure of the spring 30. the position of the finger lever being such that when the forward end thereof engages certain of the rivet heads, of each of the teeth, the blade will be properly positioned for the grinding of a tooth. Thus, is provided a means for accurately setting the blade and another means for securing the blade in adjusted po sition.

In the use of the positioning device the proper fastening or inclination-of the blade in transverse relation to the grinding surface of the wheel 2 is secured by an adjustment of the rods 8 with relation to the tubular standards 6. Obviously, this angle may be oblique in either direction, so that either of the inclined edges of the teeth may be ground. After this setting is secured, the set screws 15 are tightened up in order to rigidly positionthe bar 14 with relation to the standards. Then the butterfly nuts 13 may be loosened and the proper angular re lation of the bar 14 toward and away from the grinding surface may be secured, the tightening of the upperfile ends thus holding its angular position throughout the sharpening operation.

After the frame proper has been adjusted the blade may be inserted in the guide, the parts of the bladebeing positioned as described above, andthe teeth projecting forwardly beyond the guide bar 14. The bar may be then slid relatively to the guide bars, and when a tooth to be sharpened'is properly positioned the finger lever 28 can be engaged over the rivet which appears opposite the free end of the lever, so that the proper position of the teeth for the grinding operation may be determined. Then, the screw 29 may be turned against the blade in order to rigidly position i it until the grinding of the edge has been accomplished.

From the foregoing it will be evident that I have provided an attachment forgrinding machines by means of which a mower blade may be quickly and accurately sharpened with a minimum of labor since one man is capable of operating the grind stone and watching the blade. Also it will be obvious that the various angular positions of the blade may be obtained with a minimum of effort and when once secured may be accurately maintained so that the grindingof the teeth may be accomplished with uniformity and accuracy. When the blade is held by hand it is practically impossible to secure a straight bevel of the grinding operation, hand supported blades being rounded by reason of the inability of the operator to hold the blade for a straight bevel.

lVhat I claim as my invention is 1. A blade support for grinding machines, comprising in combination a plurality of vertically adjustable standards adapted to be carried by a grinding wheel frame. a

guide bar hinged to each of the standards,

said bar being capable of being positioned in various angular positions transversely of the grinding wheel, and means for angularly adjusting the guide-bar toward and from the grinding wheel.

2. A blade support for grinding machines, comprising in combination a plurality of vertically adjustable standards adapted to be carried by a grinding wheel'fr'ame,,a guide bar hinged to each-ofthe standards;

said bar being capable of being positioned 130 masses in various angular positions transversely of the grinding wheel, a spring pressed device on the guide bar to position successive teeth opposite the grinding wheel means for angularly adjusting the guide-bar toward and from the grinding Wheel, and said guide-bar carrying spaced plates at its ends between which a blade may be clamped.

3. A blade support for grinding machines, comprising in combination a plurality of vertically adjustable standards adapted to be carried by a grinding wheel frame, a guide bar hinged to each of the standards,

said bar being capable of being positioned in various angular positions transversely of the grinding wheel, and means for angularly adjusting the guide-bar toward and from the grinding wheel, and a resilient clamp device for securing the blade to set successive teeth in grinding position.

In testimony whereof, I affix my signature in the presence of two Witnesses.

THEODORE JACOBS. Witnesses:

J. J. LAWRENCE, G. lV. HUBER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

